modules: camera: Shutter notify message support

The shutter callback timestamp should originate from the sensor itself,
since it knows exactly when the first line of the frame started
exposing.  However, as a fallback (or in the CPU-painting case) query
CLOCK_BOOTTIME instead.

Change-Id: Id57c05525e9c575d009b9deb96a69557fccac16b

2 files changed, 28 insertions, 0 deletions

diff --git a/modules/camera/Camera.cpp b/modules/camera/Camera.cpp
index 10464cb..1c307de 100644
--- a/modules/camera/Camera.cpp
+++ b/modules/camera/Camera.cpp
@@ -544,6 +544,7 @@ int Camera::processCaptureRequest(camera3_capture_request_t *request)
     // TODO: return actual captured/reprocessed settings
     result.result = request->settings;
     // TODO: asynchronously return results
+    notifyShutter(request->frame_number, 0);
     mCallbackOps->process_capture_result(mCallbackOps, &result);
 
     return 0;
@@ -606,6 +607,31 @@ int Camera::processCaptureBuffer(const camera3_stream_buffer_t *in,
     return 0;
 }
 
+void Camera::notifyShutter(uint32_t frame_number, uint64_t timestamp)
+{
+    int res;
+    struct timespec ts;
+
+    // If timestamp is 0, get timestamp from right now instead
+    if (timestamp == 0) {
+        ALOGW("%s:%d: No timestamp provided, using CLOCK_BOOTTIME",
+                __func__, mId);
+        res = clock_gettime(CLOCK_BOOTTIME, &ts);
+        if (res == 0) {
+            timestamp = ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+        } else {
+            ALOGE("%s:%d: No timestamp and failed to get CLOCK_BOOTTIME %s(%d)",
+                    __func__, mId, strerror(errno), errno);
+        }
+    }
+    camera3_notify_msg_t m;
+    memset(&m, 0, sizeof(m));
+    m.type = CAMERA3_MSG_SHUTTER;
+    m.message.shutter.frame_number = frame_number;
+    m.message.shutter.timestamp = timestamp;
+    mCallbackOps->notify(mCallbackOps, &m);
+}
+
 void Camera::getMetadataVendorTagOps(vendor_tag_query_ops_t *ops)
 {
     ALOGV("%s:%d: ops=%p", __func__, mId, ops);
diff --git a/modules/camera/Camera.h b/modules/camera/Camera.h
index c7ee52d..16e1439 100644
--- a/modules/camera/Camera.h
+++ b/modules/camera/Camera.h
@@ -72,6 +72,8 @@ class Camera {
         // Process an output buffer
         int processCaptureBuffer(const camera3_stream_buffer_t *in,
                 camera3_stream_buffer_t *out);
+        // Send a shutter notify message with start of exposure time
+        void notifyShutter(uint32_t frame_number, uint64_t timestamp);
 
         // Identifier used by framework to distinguish cameras
         const int mId;